Weight Paint Box is a Blender add-on built around rigging and weight painting, bringing two tools together in one organized panel. It works with any rig, and the developer notes that a character should first be parented to the armature using Automatic Weights before the weight box is used.
The weight-painting side replaces the traditional brush with a deformation box you can reshape like a normal cube and fit automatically to a target object in the list. Each face of the box carries its own smooth circle that works separately for precise results, with adjustable smooth strength and direction, inside or outside the box. You can paint multiple separate objects at once, handle and mirror several vertex groups, view all vertex groups together, and use the box as a mask to hide geometry outside it in Weight Paint mode.
The Draw Bone side creates custom bone rigs or uses Rigify mode for a basic human and MetaHuman without face. It offers chain types such as arms, legs, fingers, spine, tail, or free draw, a one-click Smart Chain that places and connects bones, symmetry, and placement tools for drawing in the center or on the surface.